Magnesium dichloride-ethanol adducts and catalyst component obtained therefrom
a technology of magnetene ethanol and catalyst components, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of phthalates recently raised concerns and the activity/stereospecificity balance is very far from being acceptable for industrial exploitation
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[0055]Synthesis of 3,5-di-tert-butyl-1,2-phenylene bis(diethylcarbamate)
[0056]5 g of 3,5-di-tert-butylcatechol (22.5 mmol) are charged in a round bottom flask with 60 mL of THF under nitrogen. 1.2 g of NaH (47.3 mmol) are added carefully under stirring then 6.3 mL of diethylcarbamoyl chloride (50 mmol) are added dropwise. The mixture is left to stir at room temperature until GC shows that the reaction is completed. Then the mixture is diluted with acidic water (180 mL) and extracted with ethyl acetate (100 mL). The organic layer is washed with water until neutral pH, then is anhydrified over Na2SO4 and the solvent is distilled off to afford 9.4 g of residue (99% of yield) with a GC purity of 99%.
[0057]Synthesis of 4-(tert-butyl)-1,2-phenylene bis(diethylcarbamate)
[0058]The procedure is the same as that used for 3,5-di-tert-butyl-1,2-phenylene bis(diethylcarbamate) except that 4-tert-butylcatechol is used as starting diol.
[0059]Synthesis of 5-(tert-butyl)-3-methyl-1,2-phenylene bis(d...
examples 1-11
[0079]The catalyst components were prepared according to the general procedure using the donors indicated in Table 1. The so obtained solid catalyst components were analyzed for their composition, and were tested in polymerization of propylene, using the procedure described above. The results are listed in Table 1.
example 12
[0080]The same procedure of example 1 was used with the only difference that the spherical adduct before being, used in the preparation of the catalyst, was exposed to a thermal dealcoholation at increasing temperatures from 30 to 130° C. operating in nitrogen current until the residual alcohol content was 50% wt based on the total weight of the adduct.
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